/Engine/Source/Runtime/RHI/Public/DynamicRHI.h
Function that can be used to update which is the first visible mip to the GPU.
virtual void RHIVirtualTextureSetFirstMipVisible ( class [FRHICommandListImmediate](API\Runtime\RHI\FRHICommandListImmediate) & RHICmdList, FRHITexture2D * Texture, uint32 FirstMip )